789878989 has 4 divisors (see below), whose sum is σ = 789954880. Its totient is φ = 789803100.

The previous prime is 789878983. The next prime is 789878993. The reversal of 789878989 is 989878987.

789878989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

789878989 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 989878987 = 9467 ⋅104561.

It is a cyclic number.

It is not a de Polignac number, because 789878989 - 2⁷ = 789878861 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (789878983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19269 + ... + 44170.

It is an arithmetic number, because the mean of its divisors is an integer number (197488720).

Almost surely, 2^789878989 is an apocalyptic number.

It is an amenable number.

789878989 is a deficient number, since it is larger than the sum of its proper divisors (75891).

789878989 is a wasteful number, since it uses less digits than its factorization.

789878989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75890.

The product of its digits is 146313216, while the sum is 73.

The square root of 789878989 is about 28104.7858735839. The cubic root of 789878989 is about 924.3863430186.

The spelling of 789878989 in words is "seven hundred eighty-nine million, eight hundred seventy-eight thousand, nine hundred eighty-nine".